<html>
    <head>

    </head>
    <script>

    function Foo(){

    }
    var f1= new Foo();
    f1.a =10;
    Foo.prototype.a =100;
    Foo.prototype.b =200

    console.log(f1.a)
    console.log(f1.b)

    var item;

    for (item in f1){
      console.log(f1[item])
    }

  

    </script>
</html>


